S(Cl)(Cl)=O.[C:5]1([C:11]2[CH:20]=[C:19]([CH2:21][CH2:22][CH2:23][C:24]([OH:26])=O)[C:18]3[C:13](=[CH:14][CH:15]=[CH:16][CH:17]=3)[N:12]=2)[CH:10]=[CH:9][CH:8]=[CH:7][CH:6]=1.[CH2:27]([NH:29][CH2:30][CH3:31])[CH3:28].O>C(Cl)(Cl)Cl>[CH2:27]([N:29]([CH2:30][CH3:31])[C:24](=[O:26])[CH2:23][CH2:22][CH2:21][C:19]1[C:18]2[C:13](=[CH:14][CH:15]=[CH:16][CH:17]=2)[N:12]=[C:11]([C:5]2[CH:10]=[CH:9][CH:8]=[CH:7][CH:6]=2)[CH:20]=1)[CH3:28]Thionyl chloride (1.02 cc) is added to a solution of 2-phenyl-4-quinolinebutanoic acid (3.7 g) in chloroform (60 cc), and the mixture is heated under reflux for 15 minutes. The solvents are evaporated off under reduced pressure. The residue obtained is dissolved in chloroform (40 cc). Diethylamine (6 cc) is added slowly to this solution in the course of 20 minutes. The mixture is stirred for 3 hours at room temperature (approximately 20° C.) and taken up with water (40 cc). The organic phase is decanted, washed with water (40 cc), dried over magnesium sulphate and evaporated under reduced pressure. The residue is chromatographed on silica gel, using a cyclohexane/ethyl acetate (50:50 by volume) mixture as eluant. N,N-Diethyl-2-phenyl-4-quinolinebutanamide (3.3 g) is thereby obtained, and this is converted to the monohydrochloride in acetone. The hydrochloride melts at 130° C.
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